8 Preparation
Installer reference guide
27
EJHA EHY32AA
Daikin Altherma Hybrid hydrosplit heat pump
4P531180-1 – 2018.06
In case of third-party gas boiler
d
D1
D2
D3
D4
D4
D3
b
a
c
H1
a
Outdoor unit
b
Third-party gas boiler
c
Space heating circuit
d
External pump
What?
Distance
H1
Maximum height difference between
outdoor unit and third-party gas
boiler
Depends on the
expansion vessel in the
third-party gas boiler.
—
Maximum total length of the water
piping (indoor part + outdoor part)
Depends on the
external static pressure
(ESP) of the system.
D1
Maximum distance between outdoor
unit and external pump
10 m
D2
Distance between external pump and
gas boiler
As short as possible.
D3
Maximum length of the outdoor part
of the water piping (to prevent
freeze-up of the water piping)
30 m
D4
Maximum distance between outdoor
unit and third-party gas boiler
See table below.
If...
Then D4...
Glycol?
Ø
Condition
(a)
ESP 25 kPa ESP 35 kPa
Water
(without
glycol)
3/4" ΔT 5°C → 11.5 l/min
20 m
13 m
ΔT 8°C → 7.2 l/min
68 m
50 m
1" ΔT 5°C → 11.5 l/min
123 m
88 m
ΔT 8°C → 7.2 l/min
340 m
260 m
Water +
glycol
1" Start-up with glycol
at –15°C → 7.0 l/min
44 m
30 m
ΔT 5°C with glycol at
20°C → 12.8 l/min
36 m
14 m
ΔT 8°C with glycol at
20°C → 8.0 l/min
170 m
120 m
(a)
Based on capacity of 4 kW
ESP
External static pressure calculated with 10×(90° elbow)
8.3.2
Water circuit requirements
INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
NOTICE
In case of plastic pipes, make sure they are fully oxygen
diffusion tight according to DIN 4726. The diffusion of
oxygen into the piping can lead to excessive corrosion.
▪
Connecting piping – Legislation.
Make all piping connections in
accordance with the applicable legislation and the instructions in
the "Installation" chapter, respecting the water inlet and outlet.
▪
Connecting piping – Force.
Do NOT use excessive force when
connecting the piping. Deformation of the piping can cause
malfunctioning of the unit.
▪
Connecting piping – Tools.
Only use appropriate tooling to
handle brass, which is a soft material. If NOT, pipes will get
damaged.
▪
Connecting piping – Air, moisture, dust.
If air, moisture or dust
gets into the circuit, problems may occur. To prevent this:
▪ Only use clean pipes
▪ Hold the pipe end downwards when removing burrs.
▪ Cover the pipe end when inserting it through a wall, to prevent
dust and/or particles from entering the pipe.
▪ Use a decent thread sealant to seal connections.
NOTICE
If glycol is present in the system, make sure the thread
sealant used is resistant to glycol.
▪
Closed circuit.
Use the outdoor unit ONLY in a closed water
system. Using the system in an open water system will lead to
excessive corrosion.
▪
Piping length.
It is recommended to avoid long runs of piping
between the domestic hot water tank and the hot water end point
(shower, bath,…) and to avoid dead ends.
▪
Piping diameter.
Select the water piping diameter in relation to
the required water flow and the available external static pressure
of the pump. See
"17 Technical data" on page 94
for the external
static pressure curves of the outdoor unit.
▪
Water flow.
See
"8.3.4 To check the water volume and flow
.
Minimum required flow rate
7 l/min
(a)
(a)
Below this value, no stable operation can be guaranteed.
▪
Field supply components – Water and glycol.
Only use
materials that are compatible with the water (and, if applicable,
glycol) used in the system, and with the materials used in the
outdoor unit.
▪
Field supply components – Water pressure and temperature.
Check that all components in the field piping can withstand the
water pressure and water temperature.
▪
Water pressure.
The maximum water pressure is 4 bar. Provide
adequate safeguards in the water circuit to ensure that the
maximum pressure is NOT exceeded.
▪
Water temperature – Heat pump convectors.
In case heat
pump convectors are connected, the temperature of the water in
the convectors should NOT exceed 65°C. If necessary, install a
thermostatic controlled valve.
▪
Water temperature – Underfloor heating loops.
In case
underfloor heating loops are connected, install a mixing station to
prevent water that is too hot from entering the underfloor heating
circuit.
▪
Water temperature.
All installed piping and piping accessories
(valve, connections,…) MUST withstand the temperatures as
indicated in
"5.1.1 Dedicated gas boiler" on page 11
.
▪
Drainage – Low points.
Provide drain taps at all low points of the
system in order to allow complete drainage of the water circuit.
▪
Drainage – Pressure relief valve.
Provide a proper drain for the
pressure relief valve to avoid water coming into contact with
electrical parts.
▪
Air vents.
Provide air vents at all high points of the system, which
must also be easily accessible for servicing. If you use automatic
air purge valves, check that the air purges are NOT tightened too
much, so that automatic release of air in the water circuit is
possible.
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